[PATCH 1/1] powerpc: get_wchan(): solve possible race scenario due to parallel wakeup

Add a check for p->state == TASK_RUNNING so that any wake-ups on task_struct p in the interim lead to 0 being returned by get_wchan(). Signed-off-by: Kautuk Consul <kautuk.consul.1...@gmail.com> --- arch/powerpc/kernel/process.c |3 ++- 1 file changed, 2 insertions(+), 1 deletion

[PATCH 1/1] powerpc: get_wchan(): solve possible race scenario due to parallel wakeup

Add a check for p->state == TASK_RUNNING so that any wake-ups on task_struct p in the interim lead to 0 being returned by get_wchan(). Signed-off-by: Kautuk Consul --- arch/powerpc/kernel/process.c |3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/ker

Re: [PATCH 1/1] do_exit(): Solve possibility of BUG() due to race with try_to_wake_up()

ned upon and not really acceptable nowadays). I'll review those drivers for this kind of mistake. On Mon, Aug 25, 2014 at 9:27 PM, Oleg Nesterov wrote: > On 08/25, Kautuk Consul wrote: >> >> I encountered a BUG() scenario within do_exit() on an ARM system. >> >> The pro

[PATCH 1/1] do_exit(): Solve possibility of BUG() due to race with try_to_wake_up()

his will involve lesser changes to the kernel core code. ii) Any further sleeping primitives in the kernel also need not suffer from this kind of race scenario. Signed-off-by: Kautuk Consul --- kernel/exit.c | 10 ++ 1 file changed, 6 insertions(+), 4 dele

[PATCH 1/1] do_exit(): Solve possibility of BUG() due to race with try_to_wake_up()

) Any further sleeping primitives in the kernel also need not suffer from this kind of race scenario. Signed-off-by: Kautuk Consul consul.kau...@gmail.com --- kernel/exit.c | 10 ++ 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/exit.c b

Re: [PATCH 1/1] do_exit(): Solve possibility of BUG() due to race with try_to_wake_up()

upon and not really acceptable nowadays). I'll review those drivers for this kind of mistake. On Mon, Aug 25, 2014 at 9:27 PM, Oleg Nesterov o...@redhat.com wrote: On 08/25, Kautuk Consul wrote: I encountered a BUG() scenario within do_exit() on an ARM system. The problem is due to a race

Re: [QUERY]: Understanding the calculations in mm/page-writeback.c

> > Here is the slides I used in LinuxCon Japan 2012, please feel free to > ask more specific questions on it :) > > http://events.linuxfoundation.org/images/stories/pdf/lcjp2012_wu.pdf > Thanks for your help and early response ! I shall definitely study this and ping you as and when doubts start

Re: [QUERY]: Understanding the calculations in mm/page-writeback.c

Here is the slides I used in LinuxCon Japan 2012, please feel free to ask more specific questions on it :) http://events.linuxfoundation.org/images/stories/pdf/lcjp2012_wu.pdf Thanks for your help and early response ! I shall definitely study this and ping you as and when doubts start